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app/internal/window: implement dp/sp scaling in X11 driver

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Use a constant 1.0 scaling from dp to pixels and adjust with user prefs.

Signed-off-by: Denis Bernard <db047h@gmail.com>
This commit is contained in:
Denis Bernard
2019-11-04 16:29:53 +01:00
committed by Elias Naur
parent 90de8b6360
commit c5449f0f74
1 changed files with 40 additions and 3 deletions
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app/internal/window/os_x11.go
+40 -3
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@@ -11,6 +11,7 @@ package window
#include <X11/Xlib.h>
#include <X11/Xatom.h>
#include <X11/Xutil.h>
#include <X11/Xresource.h>
#define GIO_FIELD_OFFSET(typ, field) const int gio_##typ##_##field##_off = offsetof(typ, field)
GIO_FIELD_OFFSET(XClientMessageEvent, data);
GIO_FIELD_OFFSET(XExposeEvent, count);
@@ -60,6 +61,7 @@ import (
"errors"
"fmt"
"image"
"strconv"
"sync"
"time"
"unsafe"
@@ -504,6 +506,7 @@ func newX11Window(gioWin Callbacks, opts *Options) error {
if C.XInitThreads() == 0 {
err = errors.New("x11: threads init failed")
}
C.XrmInitialize()
})
if err != nil {
return err
@@ -512,15 +515,16 @@ func newX11Window(gioWin Callbacks, opts *Options) error {
if dpy == nil {
return errors.New("x11: cannot connect to the X server")
}
root := C.XDefaultRootWindow(dpy)
root := C.XDefaultRootWindow(dpy)
screen := C.XDefaultScreen(dpy)
ppsp := x11DetectUIScale(dpy, screen)
cfg := config{pxPerDp: ppsp, pxPerSp: ppsp}
var (
swa C.XSetWindowAttributes
xim C.XIM
xic C.XIC
)
cfg := config{pxPerDp: 1, pxPerSp: 1} // TODO(dennwc): real config
swa.event_mask = C.ExposureMask | C.PointerMotionMask | C.KeyPressMask
win := C.XCreateWindow(dpy, root,
0, 0, C.uint(cfg.Px(opts.Width)), C.uint(cfg.Px(opts.Height)), 0,
@@ -579,3 +583,36 @@ func newX11Window(gioWin Callbacks, opts *Options) error {
}()
return nil
}
// detectUIScale reports the system UI scale, or 1.0 if it fails.
func x11DetectUIScale(dpy *C.Display, screen C.int) float32 {
// default fixed DPI value used in most desktop UI toolkits
const defaultDesktopDPI = 96
var scale float32 = 1.0
// Get actual DPI from X resource Xft.dpi (set by GTK and Qt).
// This value is entirely based on user preferences and conflates both
// screen (UI) scaling and font scale.
rms := C.XResourceManagerString(dpy)
if rms != nil {
db := C.XrmGetStringDatabase(rms)
if db != nil {
var (
t *C.char
v C.XrmValue
)
if C.XrmGetResource(db, (*C.char)(unsafe.Pointer(&[]byte("Xft.dpi\x00")[0])),
(*C.char)(unsafe.Pointer(&[]byte("Xft.Dpi\x00")[0])), &t, &v) != C.False {
if t != nil && C.GoString(t) == "String" {
f, err := strconv.ParseFloat(C.GoString(v.addr), 32)
if err == nil {
scale = float32(f) / defaultDesktopDPI
}
}
}
C.XrmDestroyDatabase(db)
}
}
return scale
}